//import java.util.Arrays;
//import java.util.Date;
import java.util.*;
import java.sql.*;
//导入Math类的所有静态方法 当然是用的时候取得
import static java.lang.Math.*;

class StuDent {
    private String name;//只能在当前类中才能使用
    public int age;

    public void show() {
        System.out.println("姓名："+name);
    }
}

public class Stu {


    public static void main(String[] args) {
        StuDent student1 = new StuDent();
        //student1.name = "hyj";
        student1.age = 10;

        java.util.Date date = new java.util.Date();
        int[] array = {1,2,3,4,5};
        Arrays.sort(array);

        double x = 10;
        double y = 20;
        //double result = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
        double result = sqrt(pow(x, 2) + pow(y, 2));
    }
}
